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Commit | Line | Data |
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31ef9134 CL |
1 | /* |
2 | * Audio and Music Data Transmission Protocol (IEC 61883-6) streams | |
3 | * with Common Isochronous Packet (IEC 61883-1) headers | |
4 | * | |
5 | * Copyright (c) Clemens Ladisch <clemens@ladisch.de> | |
6 | * Licensed under the terms of the GNU General Public License, version 2. | |
7 | */ | |
8 | ||
9 | #include <linux/device.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/firewire.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
7b3b0d85 | 14 | #include <linux/sched.h> |
31ef9134 | 15 | #include <sound/pcm.h> |
83d8d72d | 16 | #include <sound/rawmidi.h> |
31ef9134 CL |
17 | #include "amdtp.h" |
18 | ||
19 | #define TICKS_PER_CYCLE 3072 | |
20 | #define CYCLES_PER_SECOND 8000 | |
21 | #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) | |
22 | ||
23 | #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */ | |
24 | ||
b445db44 TS |
25 | /* isochronous header parameters */ |
26 | #define ISO_DATA_LENGTH_SHIFT 16 | |
31ef9134 CL |
27 | #define TAG_CIP 1 |
28 | ||
b445db44 | 29 | /* common isochronous packet header parameters */ |
31ef9134 | 30 | #define CIP_EOH (1u << 31) |
b445db44 | 31 | #define CIP_EOH_MASK 0x80000000 |
31ef9134 | 32 | #define CIP_FMT_AM (0x10 << 24) |
b445db44 TS |
33 | #define CIP_FMT_MASK 0x3f000000 |
34 | #define CIP_SYT_MASK 0x0000ffff | |
35 | #define CIP_SYT_NO_INFO 0xffff | |
36 | #define CIP_FDF_MASK 0x00ff0000 | |
37 | #define CIP_FDF_SFC_SHIFT 16 | |
38 | ||
39 | /* | |
40 | * Audio and Music transfer protocol specific parameters | |
41 | * only "Clock-based rate control mode" is supported | |
42 | */ | |
43 | #define AMDTP_FDF_AM824 (0 << (CIP_FDF_SFC_SHIFT + 3)) | |
2b3fc456 | 44 | #define AMDTP_FDF_NO_DATA 0xff |
b445db44 TS |
45 | #define AMDTP_DBS_MASK 0x00ff0000 |
46 | #define AMDTP_DBS_SHIFT 16 | |
47 | #define AMDTP_DBC_MASK 0x000000ff | |
31ef9134 CL |
48 | |
49 | /* TODO: make these configurable */ | |
50 | #define INTERRUPT_INTERVAL 16 | |
51 | #define QUEUE_LENGTH 48 | |
52 | ||
2b3fc456 | 53 | #define IN_PACKET_HEADER_SIZE 4 |
4b7da117 TS |
54 | #define OUT_PACKET_HEADER_SIZE 0 |
55 | ||
76fb8789 CL |
56 | static void pcm_period_tasklet(unsigned long data); |
57 | ||
31ef9134 | 58 | /** |
be4a2894 TS |
59 | * amdtp_stream_init - initialize an AMDTP stream structure |
60 | * @s: the AMDTP stream to initialize | |
31ef9134 | 61 | * @unit: the target of the stream |
3ff7e8f0 | 62 | * @dir: the direction of stream |
31ef9134 CL |
63 | * @flags: the packet transmission method to use |
64 | */ | |
be4a2894 | 65 | int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, |
3ff7e8f0 | 66 | enum amdtp_stream_direction dir, enum cip_flags flags) |
31ef9134 | 67 | { |
31ef9134 | 68 | s->unit = fw_unit_get(unit); |
3ff7e8f0 | 69 | s->direction = dir; |
31ef9134 CL |
70 | s->flags = flags; |
71 | s->context = ERR_PTR(-1); | |
72 | mutex_init(&s->mutex); | |
76fb8789 | 73 | tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s); |
ec00f5e4 | 74 | s->packet_index = 0; |
31ef9134 | 75 | |
7b3b0d85 TS |
76 | init_waitqueue_head(&s->callback_wait); |
77 | s->callbacked = false; | |
78 | s->sync_slave = NULL; | |
79 | ||
31ef9134 CL |
80 | return 0; |
81 | } | |
be4a2894 | 82 | EXPORT_SYMBOL(amdtp_stream_init); |
31ef9134 CL |
83 | |
84 | /** | |
be4a2894 TS |
85 | * amdtp_stream_destroy - free stream resources |
86 | * @s: the AMDTP stream to destroy | |
31ef9134 | 87 | */ |
be4a2894 | 88 | void amdtp_stream_destroy(struct amdtp_stream *s) |
31ef9134 | 89 | { |
be4a2894 | 90 | WARN_ON(amdtp_stream_running(s)); |
31ef9134 CL |
91 | mutex_destroy(&s->mutex); |
92 | fw_unit_put(s->unit); | |
93 | } | |
be4a2894 | 94 | EXPORT_SYMBOL(amdtp_stream_destroy); |
31ef9134 | 95 | |
c5280e99 | 96 | const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = { |
a7304e3b CL |
97 | [CIP_SFC_32000] = 8, |
98 | [CIP_SFC_44100] = 8, | |
99 | [CIP_SFC_48000] = 8, | |
100 | [CIP_SFC_88200] = 16, | |
101 | [CIP_SFC_96000] = 16, | |
102 | [CIP_SFC_176400] = 32, | |
103 | [CIP_SFC_192000] = 32, | |
104 | }; | |
105 | EXPORT_SYMBOL(amdtp_syt_intervals); | |
106 | ||
31ef9134 | 107 | /** |
be4a2894 TS |
108 | * amdtp_stream_set_parameters - set stream parameters |
109 | * @s: the AMDTP stream to configure | |
31ef9134 | 110 | * @rate: the sample rate |
a7304e3b CL |
111 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
112 | * as AM824 multi-bit linear audio | |
113 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) | |
31ef9134 | 114 | * |
a7304e3b | 115 | * The parameters must be set before the stream is started, and must not be |
31ef9134 CL |
116 | * changed while the stream is running. |
117 | */ | |
be4a2894 TS |
118 | void amdtp_stream_set_parameters(struct amdtp_stream *s, |
119 | unsigned int rate, | |
120 | unsigned int pcm_channels, | |
121 | unsigned int midi_ports) | |
31ef9134 | 122 | { |
a7304e3b CL |
123 | static const unsigned int rates[] = { |
124 | [CIP_SFC_32000] = 32000, | |
125 | [CIP_SFC_44100] = 44100, | |
126 | [CIP_SFC_48000] = 48000, | |
127 | [CIP_SFC_88200] = 88200, | |
128 | [CIP_SFC_96000] = 96000, | |
129 | [CIP_SFC_176400] = 176400, | |
130 | [CIP_SFC_192000] = 192000, | |
31ef9134 | 131 | }; |
77d2a8a4 | 132 | unsigned int i, sfc, midi_channels; |
31ef9134 | 133 | |
83d8d72d TS |
134 | midi_channels = DIV_ROUND_UP(midi_ports, 8); |
135 | ||
77d2a8a4 TS |
136 | if (WARN_ON(amdtp_stream_running(s)) | |
137 | WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) | | |
83d8d72d | 138 | WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI)) |
31ef9134 CL |
139 | return; |
140 | ||
a7304e3b CL |
141 | for (sfc = 0; sfc < CIP_SFC_COUNT; ++sfc) |
142 | if (rates[sfc] == rate) | |
e84d15f6 | 143 | goto sfc_found; |
31ef9134 | 144 | WARN_ON(1); |
e84d15f6 CL |
145 | return; |
146 | ||
147 | sfc_found: | |
10550bea | 148 | s->pcm_channels = pcm_channels; |
e84d15f6 | 149 | s->sfc = sfc; |
77d2a8a4 | 150 | s->data_block_quadlets = s->pcm_channels + midi_channels; |
a7304e3b CL |
151 | s->midi_ports = midi_ports; |
152 | ||
153 | s->syt_interval = amdtp_syt_intervals[sfc]; | |
e84d15f6 CL |
154 | |
155 | /* default buffering in the device */ | |
156 | s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
157 | if (s->flags & CIP_BLOCKING) | |
158 | /* additional buffering needed to adjust for no-data packets */ | |
159 | s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; | |
77d2a8a4 TS |
160 | |
161 | /* init the position map for PCM and MIDI channels */ | |
162 | for (i = 0; i < pcm_channels; i++) | |
163 | s->pcm_positions[i] = i; | |
164 | s->midi_position = s->pcm_channels; | |
31ef9134 | 165 | } |
be4a2894 | 166 | EXPORT_SYMBOL(amdtp_stream_set_parameters); |
31ef9134 CL |
167 | |
168 | /** | |
be4a2894 TS |
169 | * amdtp_stream_get_max_payload - get the stream's packet size |
170 | * @s: the AMDTP stream | |
31ef9134 CL |
171 | * |
172 | * This function must not be called before the stream has been configured | |
be4a2894 | 173 | * with amdtp_stream_set_parameters(). |
31ef9134 | 174 | */ |
be4a2894 | 175 | unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s) |
31ef9134 | 176 | { |
e84d15f6 | 177 | return 8 + s->syt_interval * s->data_block_quadlets * 4; |
31ef9134 | 178 | } |
be4a2894 | 179 | EXPORT_SYMBOL(amdtp_stream_get_max_payload); |
31ef9134 | 180 | |
be4a2894 | 181 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
182 | struct snd_pcm_substream *pcm, |
183 | __be32 *buffer, unsigned int frames); | |
be4a2894 | 184 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
185 | struct snd_pcm_substream *pcm, |
186 | __be32 *buffer, unsigned int frames); | |
2b3fc456 TS |
187 | static void amdtp_read_s32(struct amdtp_stream *s, |
188 | struct snd_pcm_substream *pcm, | |
189 | __be32 *buffer, unsigned int frames); | |
31ef9134 CL |
190 | |
191 | /** | |
be4a2894 TS |
192 | * amdtp_stream_set_pcm_format - set the PCM format |
193 | * @s: the AMDTP stream to configure | |
31ef9134 CL |
194 | * @format: the format of the ALSA PCM device |
195 | * | |
a7304e3b CL |
196 | * The sample format must be set after the other paramters (rate/PCM channels/ |
197 | * MIDI) and before the stream is started, and must not be changed while the | |
198 | * stream is running. | |
31ef9134 | 199 | */ |
be4a2894 TS |
200 | void amdtp_stream_set_pcm_format(struct amdtp_stream *s, |
201 | snd_pcm_format_t format) | |
31ef9134 | 202 | { |
83d8d72d | 203 | if (WARN_ON(amdtp_stream_pcm_running(s))) |
31ef9134 CL |
204 | return; |
205 | ||
206 | switch (format) { | |
207 | default: | |
208 | WARN_ON(1); | |
209 | /* fall through */ | |
210 | case SNDRV_PCM_FORMAT_S16: | |
2b3fc456 | 211 | if (s->direction == AMDTP_OUT_STREAM) { |
10550bea | 212 | s->transfer_samples = amdtp_write_s16; |
2b3fc456 TS |
213 | break; |
214 | } | |
215 | WARN_ON(1); | |
216 | /* fall through */ | |
31ef9134 | 217 | case SNDRV_PCM_FORMAT_S32: |
10550bea TS |
218 | if (s->direction == AMDTP_OUT_STREAM) |
219 | s->transfer_samples = amdtp_write_s32; | |
220 | else | |
221 | s->transfer_samples = amdtp_read_s32; | |
31ef9134 CL |
222 | break; |
223 | } | |
224 | } | |
be4a2894 | 225 | EXPORT_SYMBOL(amdtp_stream_set_pcm_format); |
31ef9134 | 226 | |
76fb8789 | 227 | /** |
be4a2894 TS |
228 | * amdtp_stream_pcm_prepare - prepare PCM device for running |
229 | * @s: the AMDTP stream | |
76fb8789 CL |
230 | * |
231 | * This function should be called from the PCM device's .prepare callback. | |
232 | */ | |
be4a2894 | 233 | void amdtp_stream_pcm_prepare(struct amdtp_stream *s) |
76fb8789 CL |
234 | { |
235 | tasklet_kill(&s->period_tasklet); | |
236 | s->pcm_buffer_pointer = 0; | |
237 | s->pcm_period_pointer = 0; | |
92b862c7 | 238 | s->pointer_flush = true; |
76fb8789 | 239 | } |
be4a2894 | 240 | EXPORT_SYMBOL(amdtp_stream_pcm_prepare); |
76fb8789 | 241 | |
be4a2894 | 242 | static unsigned int calculate_data_blocks(struct amdtp_stream *s) |
31ef9134 CL |
243 | { |
244 | unsigned int phase, data_blocks; | |
245 | ||
ccccad86 TS |
246 | if (s->flags & CIP_BLOCKING) |
247 | data_blocks = s->syt_interval; | |
248 | else if (!cip_sfc_is_base_44100(s->sfc)) { | |
31ef9134 CL |
249 | /* Sample_rate / 8000 is an integer, and precomputed. */ |
250 | data_blocks = s->data_block_state; | |
251 | } else { | |
252 | phase = s->data_block_state; | |
253 | ||
254 | /* | |
255 | * This calculates the number of data blocks per packet so that | |
256 | * 1) the overall rate is correct and exactly synchronized to | |
257 | * the bus clock, and | |
258 | * 2) packets with a rounded-up number of blocks occur as early | |
259 | * as possible in the sequence (to prevent underruns of the | |
260 | * device's buffer). | |
261 | */ | |
262 | if (s->sfc == CIP_SFC_44100) | |
263 | /* 6 6 5 6 5 6 5 ... */ | |
264 | data_blocks = 5 + ((phase & 1) ^ | |
265 | (phase == 0 || phase >= 40)); | |
266 | else | |
267 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
268 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
269 | if (++phase >= (80 >> (s->sfc >> 1))) | |
270 | phase = 0; | |
271 | s->data_block_state = phase; | |
272 | } | |
273 | ||
274 | return data_blocks; | |
275 | } | |
276 | ||
be4a2894 | 277 | static unsigned int calculate_syt(struct amdtp_stream *s, |
31ef9134 CL |
278 | unsigned int cycle) |
279 | { | |
280 | unsigned int syt_offset, phase, index, syt; | |
281 | ||
282 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
283 | if (!cip_sfc_is_base_44100(s->sfc)) | |
284 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
285 | else { | |
286 | /* | |
287 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
288 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
289 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
290 | * elements is about 1386.23. Rounding the results of this | |
291 | * formula to the SYT precision results in a sequence of | |
292 | * differences that begins with: | |
293 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
294 | * This code generates _exactly_ the same sequence. | |
295 | */ | |
296 | phase = s->syt_offset_state; | |
297 | index = phase % 13; | |
298 | syt_offset = s->last_syt_offset; | |
299 | syt_offset += 1386 + ((index && !(index & 3)) || | |
300 | phase == 146); | |
301 | if (++phase >= 147) | |
302 | phase = 0; | |
303 | s->syt_offset_state = phase; | |
304 | } | |
305 | } else | |
306 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
307 | s->last_syt_offset = syt_offset; | |
308 | ||
be454366 | 309 | if (syt_offset < TICKS_PER_CYCLE) { |
e84d15f6 | 310 | syt_offset += s->transfer_delay; |
be454366 CL |
311 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; |
312 | syt += syt_offset % TICKS_PER_CYCLE; | |
31ef9134 | 313 | |
b445db44 | 314 | return syt & CIP_SYT_MASK; |
be454366 | 315 | } else { |
b445db44 | 316 | return CIP_SYT_NO_INFO; |
be454366 | 317 | } |
31ef9134 CL |
318 | } |
319 | ||
be4a2894 | 320 | static void amdtp_write_s32(struct amdtp_stream *s, |
31ef9134 CL |
321 | struct snd_pcm_substream *pcm, |
322 | __be32 *buffer, unsigned int frames) | |
323 | { | |
324 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 325 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
326 | const u32 *src; |
327 | ||
328 | channels = s->pcm_channels; | |
329 | src = (void *)runtime->dma_area + | |
e84841f9 | 330 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 331 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
332 | |
333 | for (i = 0; i < frames; ++i) { | |
334 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
335 | buffer[s->pcm_positions[c]] = |
336 | cpu_to_be32((*src >> 8) | 0x40000000); | |
31ef9134 | 337 | src++; |
31ef9134 | 338 | } |
77d2a8a4 | 339 | buffer += s->data_block_quadlets; |
31ef9134 CL |
340 | if (--remaining_frames == 0) |
341 | src = (void *)runtime->dma_area; | |
342 | } | |
343 | } | |
344 | ||
be4a2894 | 345 | static void amdtp_write_s16(struct amdtp_stream *s, |
31ef9134 CL |
346 | struct snd_pcm_substream *pcm, |
347 | __be32 *buffer, unsigned int frames) | |
348 | { | |
349 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
77d2a8a4 | 350 | unsigned int channels, remaining_frames, i, c; |
31ef9134 CL |
351 | const u16 *src; |
352 | ||
353 | channels = s->pcm_channels; | |
354 | src = (void *)runtime->dma_area + | |
e84841f9 | 355 | frames_to_bytes(runtime, s->pcm_buffer_pointer); |
31ef9134 | 356 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; |
31ef9134 CL |
357 | |
358 | for (i = 0; i < frames; ++i) { | |
359 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 TS |
360 | buffer[s->pcm_positions[c]] = |
361 | cpu_to_be32((*src << 8) | 0x40000000); | |
31ef9134 | 362 | src++; |
31ef9134 | 363 | } |
77d2a8a4 | 364 | buffer += s->data_block_quadlets; |
31ef9134 CL |
365 | if (--remaining_frames == 0) |
366 | src = (void *)runtime->dma_area; | |
367 | } | |
368 | } | |
369 | ||
2b3fc456 TS |
370 | static void amdtp_read_s32(struct amdtp_stream *s, |
371 | struct snd_pcm_substream *pcm, | |
372 | __be32 *buffer, unsigned int frames) | |
373 | { | |
374 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
375 | unsigned int channels, remaining_frames, i, c; | |
376 | u32 *dst; | |
377 | ||
378 | channels = s->pcm_channels; | |
379 | dst = (void *)runtime->dma_area + | |
380 | frames_to_bytes(runtime, s->pcm_buffer_pointer); | |
381 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
382 | ||
383 | for (i = 0; i < frames; ++i) { | |
384 | for (c = 0; c < channels; ++c) { | |
77d2a8a4 | 385 | *dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8; |
2b3fc456 TS |
386 | dst++; |
387 | } | |
388 | buffer += s->data_block_quadlets; | |
389 | if (--remaining_frames == 0) | |
390 | dst = (void *)runtime->dma_area; | |
391 | } | |
392 | } | |
393 | ||
be4a2894 | 394 | static void amdtp_fill_pcm_silence(struct amdtp_stream *s, |
31ef9134 CL |
395 | __be32 *buffer, unsigned int frames) |
396 | { | |
397 | unsigned int i, c; | |
398 | ||
399 | for (i = 0; i < frames; ++i) { | |
400 | for (c = 0; c < s->pcm_channels; ++c) | |
77d2a8a4 | 401 | buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000); |
31ef9134 CL |
402 | buffer += s->data_block_quadlets; |
403 | } | |
404 | } | |
405 | ||
be4a2894 | 406 | static void amdtp_fill_midi(struct amdtp_stream *s, |
31ef9134 CL |
407 | __be32 *buffer, unsigned int frames) |
408 | { | |
83d8d72d TS |
409 | unsigned int f, port; |
410 | u8 *b; | |
411 | ||
412 | for (f = 0; f < frames; f++) { | |
77d2a8a4 TS |
413 | buffer[s->midi_position] = 0; |
414 | b = (u8 *)&buffer[s->midi_position]; | |
83d8d72d TS |
415 | |
416 | port = (s->data_block_counter + f) % 8; | |
417 | if ((s->midi[port] == NULL) || | |
418 | (snd_rawmidi_transmit(s->midi[port], b + 1, 1) <= 0)) | |
419 | b[0] = 0x80; | |
420 | else | |
421 | b[0] = 0x81; | |
422 | ||
423 | buffer += s->data_block_quadlets; | |
424 | } | |
425 | } | |
426 | ||
427 | static void amdtp_pull_midi(struct amdtp_stream *s, | |
428 | __be32 *buffer, unsigned int frames) | |
429 | { | |
430 | unsigned int f, port; | |
431 | int len; | |
432 | u8 *b; | |
433 | ||
434 | for (f = 0; f < frames; f++) { | |
435 | port = (s->data_block_counter + f) % 8; | |
77d2a8a4 | 436 | b = (u8 *)&buffer[s->midi_position]; |
31ef9134 | 437 | |
83d8d72d TS |
438 | len = b[0] - 0x80; |
439 | if ((1 <= len) && (len <= 3) && (s->midi[port])) | |
440 | snd_rawmidi_receive(s->midi[port], b + 1, len); | |
441 | ||
442 | buffer += s->data_block_quadlets; | |
443 | } | |
31ef9134 CL |
444 | } |
445 | ||
4b7da117 TS |
446 | static void update_pcm_pointers(struct amdtp_stream *s, |
447 | struct snd_pcm_substream *pcm, | |
448 | unsigned int frames) | |
449 | { unsigned int ptr; | |
450 | ||
4b7da117 TS |
451 | ptr = s->pcm_buffer_pointer + frames; |
452 | if (ptr >= pcm->runtime->buffer_size) | |
453 | ptr -= pcm->runtime->buffer_size; | |
454 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
455 | ||
456 | s->pcm_period_pointer += frames; | |
457 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
458 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
459 | s->pointer_flush = false; | |
460 | tasklet_hi_schedule(&s->period_tasklet); | |
461 | } | |
462 | } | |
463 | ||
464 | static void pcm_period_tasklet(unsigned long data) | |
465 | { | |
466 | struct amdtp_stream *s = (void *)data; | |
467 | struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm); | |
468 | ||
469 | if (pcm) | |
470 | snd_pcm_period_elapsed(pcm); | |
471 | } | |
472 | ||
473 | static int queue_packet(struct amdtp_stream *s, | |
474 | unsigned int header_length, | |
475 | unsigned int payload_length, bool skip) | |
476 | { | |
477 | struct fw_iso_packet p = {0}; | |
7b3b0d85 TS |
478 | int err = 0; |
479 | ||
480 | if (IS_ERR(s->context)) | |
481 | goto end; | |
4b7da117 TS |
482 | |
483 | p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL); | |
484 | p.tag = TAG_CIP; | |
485 | p.header_length = header_length; | |
486 | p.payload_length = (!skip) ? payload_length : 0; | |
487 | p.skip = skip; | |
488 | err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer, | |
489 | s->buffer.packets[s->packet_index].offset); | |
490 | if (err < 0) { | |
491 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
492 | goto end; | |
493 | } | |
494 | ||
495 | if (++s->packet_index >= QUEUE_LENGTH) | |
496 | s->packet_index = 0; | |
497 | end: | |
498 | return err; | |
499 | } | |
500 | ||
501 | static inline int queue_out_packet(struct amdtp_stream *s, | |
502 | unsigned int payload_length, bool skip) | |
503 | { | |
504 | return queue_packet(s, OUT_PACKET_HEADER_SIZE, | |
505 | payload_length, skip); | |
506 | } | |
507 | ||
2b3fc456 TS |
508 | static inline int queue_in_packet(struct amdtp_stream *s) |
509 | { | |
510 | return queue_packet(s, IN_PACKET_HEADER_SIZE, | |
511 | amdtp_stream_get_max_payload(s), false); | |
512 | } | |
513 | ||
ccccad86 | 514 | static void handle_out_packet(struct amdtp_stream *s, unsigned int syt) |
31ef9134 CL |
515 | { |
516 | __be32 *buffer; | |
ccccad86 | 517 | unsigned int data_blocks, payload_length; |
31ef9134 | 518 | struct snd_pcm_substream *pcm; |
31ef9134 | 519 | |
ec00f5e4 CL |
520 | if (s->packet_index < 0) |
521 | return; | |
ec00f5e4 | 522 | |
82755abf | 523 | /* this module generate empty packet for 'no data' */ |
ccccad86 | 524 | if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO)) |
e84d15f6 | 525 | data_blocks = calculate_data_blocks(s); |
82755abf TS |
526 | else |
527 | data_blocks = 0; | |
31ef9134 | 528 | |
ccccad86 | 529 | buffer = s->buffer.packets[s->packet_index].buffer; |
31ef9134 | 530 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | |
b445db44 | 531 | (s->data_block_quadlets << AMDTP_DBS_SHIFT) | |
31ef9134 CL |
532 | s->data_block_counter); |
533 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
b445db44 | 534 | (s->sfc << CIP_FDF_SFC_SHIFT) | syt); |
31ef9134 CL |
535 | buffer += 2; |
536 | ||
537 | pcm = ACCESS_ONCE(s->pcm); | |
538 | if (pcm) | |
539 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
540 | else | |
541 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
542 | if (s->midi_ports) | |
543 | amdtp_fill_midi(s, buffer, data_blocks); | |
544 | ||
545 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
546 | ||
4b7da117 TS |
547 | payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; |
548 | if (queue_out_packet(s, payload_length, false) < 0) { | |
ec00f5e4 | 549 | s->packet_index = -1; |
be4a2894 | 550 | amdtp_stream_pcm_abort(s); |
ec00f5e4 CL |
551 | return; |
552 | } | |
31ef9134 | 553 | |
76fb8789 | 554 | if (pcm) |
4b7da117 | 555 | update_pcm_pointers(s, pcm, data_blocks); |
76fb8789 CL |
556 | } |
557 | ||
2b3fc456 TS |
558 | static void handle_in_packet(struct amdtp_stream *s, |
559 | unsigned int payload_quadlets, | |
560 | __be32 *buffer) | |
561 | { | |
562 | u32 cip_header[2]; | |
563 | unsigned int data_blocks, data_block_quadlets, data_block_counter; | |
564 | struct snd_pcm_substream *pcm = NULL; | |
565 | ||
566 | cip_header[0] = be32_to_cpu(buffer[0]); | |
567 | cip_header[1] = be32_to_cpu(buffer[1]); | |
568 | ||
569 | /* | |
570 | * This module supports 'Two-quadlet CIP header with SYT field'. | |
77d2a8a4 | 571 | * For convenience, also check FMT field is AM824 or not. |
2b3fc456 TS |
572 | */ |
573 | if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) || | |
574 | ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) || | |
575 | ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) { | |
576 | dev_info_ratelimited(&s->unit->device, | |
577 | "Invalid CIP header for AMDTP: %08X:%08X\n", | |
578 | cip_header[0], cip_header[1]); | |
579 | goto end; | |
580 | } | |
581 | ||
582 | /* Calculate data blocks */ | |
583 | if (payload_quadlets < 3 || | |
584 | ((cip_header[1] & CIP_FDF_MASK) == | |
585 | (AMDTP_FDF_NO_DATA << CIP_FDF_SFC_SHIFT))) { | |
586 | data_blocks = 0; | |
587 | } else { | |
588 | data_block_quadlets = | |
589 | (cip_header[0] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT; | |
590 | /* avoid division by zero */ | |
591 | if (data_block_quadlets == 0) { | |
592 | dev_info_ratelimited(&s->unit->device, | |
593 | "Detect invalid value in dbs field: %08X\n", | |
594 | cip_header[0]); | |
595 | goto err; | |
596 | } | |
597 | ||
598 | data_blocks = (payload_quadlets - 2) / data_block_quadlets; | |
599 | } | |
600 | ||
601 | /* Check data block counter continuity */ | |
602 | data_block_counter = cip_header[0] & AMDTP_DBC_MASK; | |
603 | if (data_block_counter != s->data_block_counter) { | |
604 | dev_info(&s->unit->device, | |
605 | "Detect discontinuity of CIP: %02X %02X\n", | |
606 | s->data_block_counter, data_block_counter); | |
607 | goto err; | |
608 | } | |
609 | ||
610 | if (data_blocks > 0) { | |
611 | buffer += 2; | |
612 | ||
613 | pcm = ACCESS_ONCE(s->pcm); | |
614 | if (pcm) | |
615 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
83d8d72d TS |
616 | |
617 | if (s->midi_ports) | |
618 | amdtp_pull_midi(s, buffer, data_blocks); | |
2b3fc456 TS |
619 | } |
620 | ||
621 | s->data_block_counter = (data_block_counter + data_blocks) & 0xff; | |
622 | end: | |
623 | if (queue_in_packet(s) < 0) | |
624 | goto err; | |
625 | ||
626 | if (pcm) | |
627 | update_pcm_pointers(s, pcm, data_blocks); | |
628 | ||
629 | return; | |
630 | err: | |
631 | s->packet_index = -1; | |
632 | amdtp_stream_pcm_abort(s); | |
633 | } | |
634 | ||
4b7da117 TS |
635 | static void out_stream_callback(struct fw_iso_context *context, u32 cycle, |
636 | size_t header_length, void *header, | |
637 | void *private_data) | |
31ef9134 | 638 | { |
be4a2894 | 639 | struct amdtp_stream *s = private_data; |
ccccad86 | 640 | unsigned int i, syt, packets = header_length / 4; |
31ef9134 CL |
641 | |
642 | /* | |
643 | * Compute the cycle of the last queued packet. | |
644 | * (We need only the four lowest bits for the SYT, so we can ignore | |
645 | * that bits 0-11 must wrap around at 3072.) | |
646 | */ | |
647 | cycle += QUEUE_LENGTH - packets; | |
648 | ||
ccccad86 TS |
649 | for (i = 0; i < packets; ++i) { |
650 | syt = calculate_syt(s, ++cycle); | |
651 | handle_out_packet(s, syt); | |
652 | } | |
13882a82 | 653 | fw_iso_context_queue_flush(s->context); |
31ef9134 CL |
654 | } |
655 | ||
2b3fc456 TS |
656 | static void in_stream_callback(struct fw_iso_context *context, u32 cycle, |
657 | size_t header_length, void *header, | |
658 | void *private_data) | |
659 | { | |
660 | struct amdtp_stream *s = private_data; | |
7b3b0d85 | 661 | unsigned int p, syt, packets, payload_quadlets; |
2b3fc456 TS |
662 | __be32 *buffer, *headers = header; |
663 | ||
664 | /* The number of packets in buffer */ | |
665 | packets = header_length / IN_PACKET_HEADER_SIZE; | |
666 | ||
667 | for (p = 0; p < packets; p++) { | |
668 | if (s->packet_index < 0) | |
7b3b0d85 TS |
669 | break; |
670 | ||
2b3fc456 TS |
671 | buffer = s->buffer.packets[s->packet_index].buffer; |
672 | ||
7b3b0d85 TS |
673 | /* Process sync slave stream */ |
674 | if (s->sync_slave && s->sync_slave->callbacked) { | |
675 | syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK; | |
676 | handle_out_packet(s->sync_slave, syt); | |
677 | } | |
678 | ||
2b3fc456 TS |
679 | /* The number of quadlets in this packet */ |
680 | payload_quadlets = | |
681 | (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4; | |
682 | handle_in_packet(s, payload_quadlets, buffer); | |
683 | } | |
684 | ||
7b3b0d85 TS |
685 | /* Queueing error or detecting discontinuity */ |
686 | if (s->packet_index < 0) { | |
687 | /* Abort sync slave. */ | |
688 | if (s->sync_slave) { | |
689 | s->sync_slave->packet_index = -1; | |
690 | amdtp_stream_pcm_abort(s->sync_slave); | |
691 | } | |
692 | return; | |
693 | } | |
694 | ||
695 | /* when sync to device, flush the packets for slave stream */ | |
696 | if (s->sync_slave && s->sync_slave->callbacked) | |
697 | fw_iso_context_queue_flush(s->sync_slave->context); | |
698 | ||
2b3fc456 TS |
699 | fw_iso_context_queue_flush(s->context); |
700 | } | |
701 | ||
7b3b0d85 TS |
702 | /* processing is done by master callback */ |
703 | static void slave_stream_callback(struct fw_iso_context *context, u32 cycle, | |
704 | size_t header_length, void *header, | |
705 | void *private_data) | |
706 | { | |
707 | return; | |
708 | } | |
709 | ||
710 | /* this is executed one time */ | |
711 | static void amdtp_stream_first_callback(struct fw_iso_context *context, | |
712 | u32 cycle, size_t header_length, | |
713 | void *header, void *private_data) | |
714 | { | |
715 | struct amdtp_stream *s = private_data; | |
716 | ||
717 | /* | |
718 | * For in-stream, first packet has come. | |
719 | * For out-stream, prepared to transmit first packet | |
720 | */ | |
721 | s->callbacked = true; | |
722 | wake_up(&s->callback_wait); | |
723 | ||
724 | if (s->direction == AMDTP_IN_STREAM) | |
725 | context->callback.sc = in_stream_callback; | |
726 | else if ((s->flags & CIP_BLOCKING) && (s->flags & CIP_SYNC_TO_DEVICE)) | |
727 | context->callback.sc = slave_stream_callback; | |
728 | else | |
729 | context->callback.sc = out_stream_callback; | |
730 | ||
731 | context->callback.sc(context, cycle, header_length, header, s); | |
732 | } | |
733 | ||
31ef9134 | 734 | /** |
be4a2894 TS |
735 | * amdtp_stream_start - start transferring packets |
736 | * @s: the AMDTP stream to start | |
31ef9134 CL |
737 | * @channel: the isochronous channel on the bus |
738 | * @speed: firewire speed code | |
739 | * | |
740 | * The stream cannot be started until it has been configured with | |
be4a2894 TS |
741 | * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI |
742 | * device can be started. | |
31ef9134 | 743 | */ |
be4a2894 | 744 | int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed) |
31ef9134 CL |
745 | { |
746 | static const struct { | |
747 | unsigned int data_block; | |
748 | unsigned int syt_offset; | |
749 | } initial_state[] = { | |
750 | [CIP_SFC_32000] = { 4, 3072 }, | |
751 | [CIP_SFC_48000] = { 6, 1024 }, | |
752 | [CIP_SFC_96000] = { 12, 1024 }, | |
753 | [CIP_SFC_192000] = { 24, 1024 }, | |
754 | [CIP_SFC_44100] = { 0, 67 }, | |
755 | [CIP_SFC_88200] = { 0, 67 }, | |
756 | [CIP_SFC_176400] = { 0, 67 }, | |
757 | }; | |
2b3fc456 TS |
758 | unsigned int header_size; |
759 | enum dma_data_direction dir; | |
2b3fc456 | 760 | int type, err; |
31ef9134 CL |
761 | |
762 | mutex_lock(&s->mutex); | |
763 | ||
be4a2894 | 764 | if (WARN_ON(amdtp_stream_running(s) || |
4b7da117 | 765 | (s->data_block_quadlets < 1))) { |
31ef9134 CL |
766 | err = -EBADFD; |
767 | goto err_unlock; | |
768 | } | |
769 | ||
4b7da117 | 770 | s->data_block_counter = 0; |
31ef9134 CL |
771 | s->data_block_state = initial_state[s->sfc].data_block; |
772 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
773 | s->last_syt_offset = TICKS_PER_CYCLE; | |
774 | ||
2b3fc456 TS |
775 | /* initialize packet buffer */ |
776 | if (s->direction == AMDTP_IN_STREAM) { | |
777 | dir = DMA_FROM_DEVICE; | |
778 | type = FW_ISO_CONTEXT_RECEIVE; | |
779 | header_size = IN_PACKET_HEADER_SIZE; | |
2b3fc456 TS |
780 | } else { |
781 | dir = DMA_TO_DEVICE; | |
782 | type = FW_ISO_CONTEXT_TRANSMIT; | |
783 | header_size = OUT_PACKET_HEADER_SIZE; | |
2b3fc456 | 784 | } |
31ef9134 | 785 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, |
2b3fc456 | 786 | amdtp_stream_get_max_payload(s), dir); |
31ef9134 CL |
787 | if (err < 0) |
788 | goto err_unlock; | |
789 | ||
790 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
2b3fc456 | 791 | type, channel, speed, header_size, |
7b3b0d85 | 792 | amdtp_stream_first_callback, s); |
31ef9134 CL |
793 | if (IS_ERR(s->context)) { |
794 | err = PTR_ERR(s->context); | |
795 | if (err == -EBUSY) | |
796 | dev_err(&s->unit->device, | |
be4a2894 | 797 | "no free stream on this controller\n"); |
31ef9134 CL |
798 | goto err_buffer; |
799 | } | |
800 | ||
be4a2894 | 801 | amdtp_stream_update(s); |
31ef9134 | 802 | |
ec00f5e4 | 803 | s->packet_index = 0; |
4b7da117 | 804 | do { |
2b3fc456 TS |
805 | if (s->direction == AMDTP_IN_STREAM) |
806 | err = queue_in_packet(s); | |
807 | else | |
808 | err = queue_out_packet(s, 0, true); | |
4b7da117 TS |
809 | if (err < 0) |
810 | goto err_context; | |
811 | } while (s->packet_index > 0); | |
31ef9134 | 812 | |
2b3fc456 | 813 | /* NOTE: TAG1 matches CIP. This just affects in stream. */ |
7b3b0d85 | 814 | s->callbacked = false; |
2b3fc456 TS |
815 | err = fw_iso_context_start(s->context, -1, 0, |
816 | FW_ISO_CONTEXT_MATCH_TAG1); | |
31ef9134 CL |
817 | if (err < 0) |
818 | goto err_context; | |
819 | ||
820 | mutex_unlock(&s->mutex); | |
821 | ||
822 | return 0; | |
823 | ||
824 | err_context: | |
825 | fw_iso_context_destroy(s->context); | |
826 | s->context = ERR_PTR(-1); | |
827 | err_buffer: | |
828 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
829 | err_unlock: | |
830 | mutex_unlock(&s->mutex); | |
831 | ||
832 | return err; | |
833 | } | |
be4a2894 | 834 | EXPORT_SYMBOL(amdtp_stream_start); |
31ef9134 | 835 | |
e9148ddd | 836 | /** |
be4a2894 TS |
837 | * amdtp_stream_pcm_pointer - get the PCM buffer position |
838 | * @s: the AMDTP stream that transports the PCM data | |
e9148ddd CL |
839 | * |
840 | * Returns the current buffer position, in frames. | |
841 | */ | |
be4a2894 | 842 | unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s) |
e9148ddd | 843 | { |
92b862c7 CL |
844 | /* this optimization is allowed to be racy */ |
845 | if (s->pointer_flush) | |
846 | fw_iso_context_flush_completions(s->context); | |
847 | else | |
848 | s->pointer_flush = true; | |
e9148ddd CL |
849 | |
850 | return ACCESS_ONCE(s->pcm_buffer_pointer); | |
851 | } | |
be4a2894 | 852 | EXPORT_SYMBOL(amdtp_stream_pcm_pointer); |
e9148ddd | 853 | |
31ef9134 | 854 | /** |
be4a2894 TS |
855 | * amdtp_stream_update - update the stream after a bus reset |
856 | * @s: the AMDTP stream | |
31ef9134 | 857 | */ |
be4a2894 | 858 | void amdtp_stream_update(struct amdtp_stream *s) |
31ef9134 CL |
859 | { |
860 | ACCESS_ONCE(s->source_node_id_field) = | |
861 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
862 | } | |
be4a2894 | 863 | EXPORT_SYMBOL(amdtp_stream_update); |
31ef9134 CL |
864 | |
865 | /** | |
be4a2894 TS |
866 | * amdtp_stream_stop - stop sending packets |
867 | * @s: the AMDTP stream to stop | |
31ef9134 CL |
868 | * |
869 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
870 | * itself can be stopped. | |
871 | */ | |
be4a2894 | 872 | void amdtp_stream_stop(struct amdtp_stream *s) |
31ef9134 CL |
873 | { |
874 | mutex_lock(&s->mutex); | |
875 | ||
be4a2894 | 876 | if (!amdtp_stream_running(s)) { |
31ef9134 CL |
877 | mutex_unlock(&s->mutex); |
878 | return; | |
879 | } | |
880 | ||
76fb8789 | 881 | tasklet_kill(&s->period_tasklet); |
31ef9134 CL |
882 | fw_iso_context_stop(s->context); |
883 | fw_iso_context_destroy(s->context); | |
884 | s->context = ERR_PTR(-1); | |
885 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
886 | ||
7b3b0d85 TS |
887 | s->callbacked = false; |
888 | ||
31ef9134 CL |
889 | mutex_unlock(&s->mutex); |
890 | } | |
be4a2894 | 891 | EXPORT_SYMBOL(amdtp_stream_stop); |
31ef9134 CL |
892 | |
893 | /** | |
be4a2894 | 894 | * amdtp_stream_pcm_abort - abort the running PCM device |
31ef9134 CL |
895 | * @s: the AMDTP stream about to be stopped |
896 | * | |
897 | * If the isochronous stream needs to be stopped asynchronously, call this | |
898 | * function first to stop the PCM device. | |
899 | */ | |
be4a2894 | 900 | void amdtp_stream_pcm_abort(struct amdtp_stream *s) |
31ef9134 CL |
901 | { |
902 | struct snd_pcm_substream *pcm; | |
903 | ||
904 | pcm = ACCESS_ONCE(s->pcm); | |
905 | if (pcm) { | |
906 | snd_pcm_stream_lock_irq(pcm); | |
907 | if (snd_pcm_running(pcm)) | |
908 | snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN); | |
909 | snd_pcm_stream_unlock_irq(pcm); | |
910 | } | |
911 | } | |
be4a2894 | 912 | EXPORT_SYMBOL(amdtp_stream_pcm_abort); |